There is 7 types of encoder:-
(1) Rotary encoder or Shaft encoder :- An Electro-
Mechanical device which converts the angular position of
shaft or axel to an analog or digital code, making it
(2) Incremental Encoder :- It is sometimes called a
(3) Absolute Position encoder :- These are used to generate
an electrical signal that indicates absolute machanical
position, or an incremental mechanical movement relative to
a refrence position.
(4) Quadrature Encoder :- the most common type of
inremental encoder uses 2 output channel (A and B) to sence
(5) Linear Encoder :- it is a sensor, transducer or
readhead paired with scale that encodes position.
(6) Open Collector Encoder :- the encoder supplied is
equipped with an npn open collector configuration which if
wired direct to counter module would require the counter
module to source current.
Will measure the position of a shaft for single rotation.
the same shaft angle will produce same reading.
# Output of encoder is gray code or binary code.
Incremental encoder: (relativ encoder)
Will give two output pulse, that can be used to measure
# logic gates and software used to determine rotation
and count pulses to determine the displacement. the
velocity can be determined time between the pulses.
Based on CPI/CGPA they shortlist the candidates & than
directly start Interview so there is no Written Exam or GD
Only PI.Interview held @ MNNIT , ALLAHABAD On-Campus on
6th,Aug, 2007 & the Questions asked to me by Interview Board
( 4 People) are from HR/SummerTraining/BTP/Subject-core,
POWER SYSTEM & MACHINE. time duration of I/V is about 15-20
Q.1 Name,hobbies & About family background ?
Q2.What u know abt NTPC ??
Q3.Why u want to choose NTPC as ur Carrier's starting i.e
power sector not any other Oragnisation or sector ??
Q1.What is the reason for transformer Noise ??
Q2.Which material is used for making Transformer oil & How u
measure its dielectric strength & Name the test ?
Q.3 Which Machine u will prefer 2 use if flammble gases are
coming out at a place & why ??
Q4.What is relation b/w Transmission Lines & Communication
Q5.What is the maximum capacity Synchronus Machine & total
powerGeneration in our country ?
Q.6 In india Power generation is at 50Hz while in America
its 60 hz ,why so ?? Advantage or disadvantage ??
Q.7 Maximum Generation Voltage in india ?
Q8. What is the Voltage regulation & why its required n how
much is permissible ? & causes of voltage variation ??
Q.9 Why electric shock is feel ?? n in a Electric Train why
we didnt feel that ?
Q.10 Have u seen/ experience of any power plant/ industry
related to the power sector ?
so these are the questions which not too diffcult i
think was asked to me.